Vehicle Drive Cycle
- Vehicle drive cycle is performed to drive vehicle at a specified pattern in which the DTC may be set, or to ensure the repair procedure is complete.
- Vehicle drive pattern is performed with vehicle at specified speed, transaxle in proper gear and for a specified amount of time for the system or component that is being monitored. See Fig 1
.
- When checking EGR system, fuel trim or evaporative emission control system, ensure ignition is off for at least 10 seconds before performing first vehicle drive cycle. Perform vehicle drive cycle up to "B" continuously at least twice. See Fig 1
.
- When checking any other systems or components, ensure ignition is off for at least 10 seconds before performing first vehicle drive cycle. Perform vehicle drive cycle up to "A" continuously at least twice. See Fig 1
.
- When performing vehicle drive cycle, ensure the following procedures are followed:
- With engine stopped, ensure throttle is fully closed, A/C is off, and transaxle is in Neutral.
- On A/T models, ensure shift lever is in Drive, overdrive switch is in ON position and power/economy switch is in "P" range when driving vehicle.
- When accelerating, ensure throttle is between 1/4 and 3/4 throttle.
- When decelerating, ensure vehicle speed decreases to less than 15 MPH or engine RPM is 1000 RPM or less. DO NOT depress brake pedal. DO NOT depress clutch on M/T models.
- When driving at constant speeds, hold throttle at steady position.
- Ensure engine coolant temperature when starting engine is at least 50°F (10°C).
- Ensure intake air temperature when starting engine is 104°F (40°C) or less.
- Ensure intake air temperature when driving vehicle is 122°F (50°C) or less.
Courtesy of CHRYSLER CORP.